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eglot.el
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;;; eglot.el --- Client for Language Server Protocol (LSP) servers -*- lexical-binding: t; -*-
;; Copyright (C) 2018-2022 Free Software Foundation, Inc.
;; Version: 1.8
;; Author: João Távora <[email protected]>
;; Maintainer: João Távora <[email protected]>
;; URL: https://github.com/joaotavora/eglot
;; Keywords: convenience, languages
;; Package-Requires: ((emacs "26.1") (jsonrpc "1.0.14") (flymake "1.2.1") (project "0.3.0") (xref "1.0.1") (eldoc "1.11.0") (seq "2.23"))
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Eglot ("Emacs Polyglot") is an Emacs LSP client that stays out of
;; your way.
;;
;; Typing M-x eglot should be enough to get you started, but here's a
;; little info (see the accompanying README.md or the URL for more).
;;
;; M-x eglot starts a server via a shell command guessed from
;; `eglot-server-programs', using the current major mode (for whatever
;; language you're programming in) as a hint. If it can't guess, it
;; prompts you in the minibuffer for these things. Actually, the
;; server does not need to be running locally: you can connect to a
;; running server via TCP by entering a <host:port> syntax.
;;
;; If the connection is successful, you should see an `eglot'
;; indicator pop up in your mode-line. More importantly, this means
;; that current *and future* file buffers of that major mode *inside
;; your current project* automatically become \"managed\" by the LSP
;; server. In other words, information about their content is
;; exchanged periodically to provide enhanced code analysis using
;; `xref-find-definitions', `flymake-mode', `eldoc-mode',
;; `completion-at-point', among others.
;;
;; To "unmanage" these buffers, shutdown the server with
;; M-x eglot-shutdown.
;;
;; To start an eglot session automatically when a foo-mode buffer is
;; visited, you can put this in your init file:
;;
;; (add-hook 'foo-mode-hook 'eglot-ensure)
;;; Code:
(require 'json)
(require 'imenu)
(require 'cl-lib)
(require 'project)
(require 'url-parse)
(require 'url-util)
(require 'pcase)
(require 'compile) ; for some faces
(require 'warnings)
(require 'flymake)
(require 'xref)
(eval-when-compile
(require 'subr-x))
(require 'jsonrpc)
(require 'filenotify)
(require 'ert)
(require 'array)
;; ElDoc is preloaded in Emacs, so `require'-ing won't guarantee we are
;; using the latest version from GNU Elpa when we load eglot.el. Use an
;; heuristic to see if we need to `load' it in Emacs < 28.
(if (and (< emacs-major-version 28)
(not (boundp 'eldoc-documentation-strategy)))
(load "eldoc")
(require 'eldoc))
;; Similar issue as above for Emacs 26.3 and seq.el.
(if (< emacs-major-version 27)
(load "seq")
(require 'seq))
;; forward-declare, but don't require (Emacs 28 doesn't seem to care)
(defvar markdown-fontify-code-blocks-natively)
(defvar company-backends)
(defvar company-tooltip-align-annotations)
;;; User tweakable stuff
(defgroup eglot nil
"Interaction with Language Server Protocol servers."
:prefix "eglot-"
:group 'applications)
(defun eglot-alternatives (alternatives)
"Compute server-choosing function for `eglot-server-programs'.
Each element of ALTERNATIVES is a string PROGRAM or a list of
strings (PROGRAM ARGS...) where program names an LSP server
program to start with ARGS. Returns a function of one argument.
When invoked, that function will return a list (ABSPATH ARGS),
where ABSPATH is the absolute path of the PROGRAM that was
chosen (interactively or automatically)."
(lambda (&optional interactive)
;; JT@2021-06-13: This function is way more complicated than it
;; could be because it accounts for the fact that
;; `eglot--executable-find' may take much longer to execute on
;; remote files.
(let* ((listified (cl-loop for a in alternatives
collect (if (listp a) a (list a))))
(err (lambda ()
(error "None of '%s' are valid executables"
(mapconcat #'car listified ", ")))))
(cond (interactive
(let* ((augmented (mapcar (lambda (a)
(let ((found (eglot--executable-find
(car a) t)))
(and found
(cons (car a) (cons found (cdr a))))))
listified))
(available (remove nil augmented)))
(cond ((cdr available)
(cdr (assoc
(completing-read
"[eglot] More than one server executable available:"
(mapcar #'car available)
nil t nil nil (car (car available)))
available #'equal)))
((cdr (car available)))
(t
;; Don't error when used interactively, let the
;; Eglot prompt the user for alternative (github#719)
nil))))
(t
(cl-loop for (p . args) in listified
for probe = (eglot--executable-find p t)
when probe return (cons probe args)
finally (funcall err)))))))
(defvar eglot-server-programs `((rust-mode . ,(eglot-alternatives '("rust-analyzer" "rls")))
(cmake-mode . ("cmake-language-server"))
(vimrc-mode . ("vim-language-server" "--stdio"))
(python-mode
. ,(eglot-alternatives
'("pylsp" "pyls" ("pyright-langserver" "--stdio"))))
((js-mode typescript-mode)
. ("typescript-language-server" "--stdio"))
(sh-mode . ("bash-language-server" "start"))
((php-mode phps-mode)
. ("php" "vendor/felixfbecker/\
language-server/bin/php-language-server.php"))
((c++-mode c-mode) . ,(eglot-alternatives
'("clangd" "ccls")))
(((caml-mode :language-id "ocaml")
(tuareg-mode :language-id "ocaml") reason-mode)
. ("ocamllsp"))
(ruby-mode
. ("solargraph" "socket" "--port" :autoport))
(haskell-mode
. ("haskell-language-server-wrapper" "--lsp"))
(elm-mode . ("elm-language-server"))
(mint-mode . ("mint" "ls"))
(kotlin-mode . ("kotlin-language-server"))
(go-mode . ("gopls"))
((R-mode ess-r-mode) . ("R" "--slave" "-e"
"languageserver::run()"))
(java-mode . eglot--eclipse-jdt-contact)
(dart-mode . ("dart_language_server"))
(elixir-mode . ("language_server.sh"))
(ada-mode . ("ada_language_server"))
(scala-mode . ("metals-emacs"))
(racket-mode . ("racket" "-l" "racket-langserver"))
((tex-mode context-mode texinfo-mode bibtex-mode)
. ("digestif"))
(erlang-mode . ("erlang_ls" "--transport" "stdio"))
(yaml-mode . ("yaml-language-server" "--stdio"))
(nix-mode . ("rnix-lsp"))
(gdscript-mode . ("localhost" 6008))
((fortran-mode f90-mode) . ("fortls"))
(lua-mode . ("lua-lsp"))
(zig-mode . ("zls"))
(css-mode . ,(eglot-alternatives '(("vscode-css-language-server" "--stdio") ("css-languageserver" "--stdio"))))
(html-mode . ,(eglot-alternatives '(("vscode-html-language-server" "--stdio") ("html-languageserver" "--stdio"))))
(json-mode . ,(eglot-alternatives '(("vscode-json-language-server" "--stdio") ("json-languageserver" "--stdio"))))
(dockerfile-mode . ("docker-langserver" "--stdio"))
(clojure-mode . ("clojure-lsp")))
"How the command `eglot' guesses the server to start.
An association list of (MAJOR-MODE . CONTACT) pairs. MAJOR-MODE
identifies the buffers that are to be managed by a specific
language server. The associated CONTACT specifies how to connect
to a server for those buffers.
MAJOR-MODE can be:
* In the most common case, a symbol such as `c-mode';
* A list (MAJOR-MODE-SYMBOL :LANGUAGE-ID ID) where
MAJOR-MODE-SYMBOL is the aforementioned symbol and ID is a
string identifying the language to the server;
* A list combining the previous two alternatives, meaning
multiple major modes will be associated with a single server
program.
CONTACT can be:
* In the most common case, a list of strings (PROGRAM [ARGS...]).
PROGRAM is called with ARGS and is expected to serve LSP requests
over the standard input/output channels.
* A list (HOST PORT [TCP-ARGS...]) where HOST is a string and
PORT is a positive integer for connecting to a server via TCP.
Remaining ARGS are passed to `open-network-stream' for
upgrading the connection with encryption or other capabilities.
* A list (PROGRAM [ARGS...] :autoport [MOREARGS...]), whereupon a
combination of the two previous options is used. First, an
attempt is made to find an available server port, then PROGRAM
is launched with ARGS; the `:autoport' keyword substituted for
that number; and MOREARGS. Eglot then attempts to establish a
TCP connection to that port number on the localhost.
* A cons (CLASS-NAME . INITARGS) where CLASS-NAME is a symbol
designating a subclass of `eglot-lsp-server', for representing
experimental LSP servers. INITARGS is a keyword-value plist
used to initialize the object of CLASS-NAME, or a plain list
interpreted as the previous descriptions of CONTACT. In the
latter case that plain list is used to produce a plist with a
suitable :PROCESS initarg to CLASS-NAME. The class
`eglot-lsp-server' descends from `jsonrpc-process-connection',
which you should see for the semantics of the mandatory
:PROCESS argument.
* A function of a single argument producing any of the above
values for CONTACT. The argument's value is non-nil if the
connection was requested interactively (e.g. from the `eglot'
command), and nil if it wasn't (e.g. from `eglot-ensure'). If
the call is interactive, the function can ask the user for
hints on finding the required programs, etc. Otherwise, it
should not ask the user for any input, and return nil or signal
an error if it can't produce a valid CONTACT.")
(defface eglot-highlight-symbol-face
'((t (:inherit bold)))
"Face used to highlight the symbol at point.")
(defface eglot-mode-line
'((t (:inherit font-lock-constant-face :weight bold)))
"Face for package-name in EGLOT's mode line.")
(defface eglot-diagnostic-tag-unnecessary-face
'((t (:inherit shadow)))
"Face used to render unused or unnecessary code.")
(defface eglot-diagnostic-tag-deprecated-face
'((t . (:inherit shadow :strike-through t)))
"Face used to render deprecated or obsolete code.")
(defcustom eglot-autoreconnect 3
"Control ability to reconnect automatically to the LSP server.
If t, always reconnect automatically (not recommended). If nil,
never reconnect automatically after unexpected server shutdowns,
crashes or network failures. A positive integer number says to
only autoreconnect if the previous successful connection attempt
lasted more than that many seconds."
:type '(choice (boolean :tag "Whether to inhibit autoreconnection")
(integer :tag "Number of seconds")))
(defcustom eglot-connect-timeout 30
"Number of seconds before timing out LSP connection attempts.
If nil, never time out."
:type 'number)
(defcustom eglot-sync-connect 3
"Control blocking of LSP connection attempts.
If t, block for `eglot-connect-timeout' seconds. A positive
integer number means block for that many seconds, and then wait
for the connection in the background. nil has the same meaning
as 0, i.e. don't block at all."
:type '(choice (boolean :tag "Whether to inhibit autoreconnection")
(integer :tag "Number of seconds")))
(defcustom eglot-autoshutdown nil
"If non-nil, shut down server after killing last managed buffer."
:type 'boolean)
(defcustom eglot-send-changes-idle-time 0.5
"Don't tell server of changes before Emacs's been idle for this many seconds."
:type 'number)
(defcustom eglot-events-buffer-size 2000000
"Control the size of the Eglot events buffer.
If a number, don't let the buffer grow larger than that many
characters. If 0, don't use an event's buffer at all. If nil,
let the buffer grow forever."
:type '(choice (const :tag "No limit" nil)
(integer :tag "Number of characters")))
(defcustom eglot-confirm-server-initiated-edits 'confirm
"Non-nil if server-initiated edits should be confirmed with user."
:type '(choice (const :tag "Don't show confirmation prompt" nil)
(symbol :tag "Show confirmation prompt" 'confirm)))
(defcustom eglot-extend-to-xref nil
"If non-nil, activate Eglot in cross-referenced non-project files."
:type 'boolean)
(defvar eglot-withhold-process-id nil
"If non-nil, Eglot will not send the Emacs process id to the language server.
This can be useful when using docker to run a language server.")
;; Customizable via `completion-category-overrides'.
(when (assoc 'flex completion-styles-alist)
(add-to-list 'completion-category-defaults '(eglot (styles flex basic))))
;;; Constants
;;;
(defconst eglot--symbol-kind-names
`((1 . "File") (2 . "Module")
(3 . "Namespace") (4 . "Package") (5 . "Class")
(6 . "Method") (7 . "Property") (8 . "Field")
(9 . "Constructor") (10 . "Enum") (11 . "Interface")
(12 . "Function") (13 . "Variable") (14 . "Constant")
(15 . "String") (16 . "Number") (17 . "Boolean")
(18 . "Array") (19 . "Object") (20 . "Key")
(21 . "Null") (22 . "EnumMember") (23 . "Struct")
(24 . "Event") (25 . "Operator") (26 . "TypeParameter")))
(defconst eglot--kind-names
`((1 . "Text") (2 . "Method") (3 . "Function") (4 . "Constructor")
(5 . "Field") (6 . "Variable") (7 . "Class") (8 . "Interface")
(9 . "Module") (10 . "Property") (11 . "Unit") (12 . "Value")
(13 . "Enum") (14 . "Keyword") (15 . "Snippet") (16 . "Color")
(17 . "File") (18 . "Reference") (19 . "Folder") (20 . "EnumMember")
(21 . "Constant") (22 . "Struct") (23 . "Event") (24 . "Operator")
(25 . "TypeParameter")))
(defconst eglot--tag-faces
`((1 . eglot-diagnostic-tag-unnecessary-face)
(2 . eglot-diagnostic-tag-deprecated-face)))
(defconst eglot--{} (make-hash-table) "The empty JSON object.")
(defun eglot--executable-find (command &optional remote)
"Like Emacs 27's `executable-find', ignore REMOTE on Emacs 26."
(if (>= emacs-major-version 27) (executable-find command remote)
(executable-find command)))
;;; Message verification helpers
;;;
(eval-and-compile
(defvar eglot--lsp-interface-alist
`(
(CodeAction (:title) (:kind :diagnostics :edit :command :isPreferred))
(ConfigurationItem () (:scopeUri :section))
(Command ((:title . string) (:command . string)) (:arguments))
(CompletionItem (:label)
(:kind :detail :documentation :deprecated :preselect
:sortText :filterText :insertText :insertTextFormat
:textEdit :additionalTextEdits :commitCharacters
:command :data :tags))
(Diagnostic (:range :message) (:severity :code :source :relatedInformation :codeDescription :tags))
(DocumentHighlight (:range) (:kind))
(FileSystemWatcher (:globPattern) (:kind))
(Hover (:contents) (:range))
(InitializeResult (:capabilities) (:serverInfo))
(Location (:uri :range))
(LocationLink (:targetUri :targetRange :targetSelectionRange) (:originSelectionRange))
(LogMessageParams (:type :message))
(MarkupContent (:kind :value))
(ParameterInformation (:label) (:documentation))
(Position (:line :character))
(Range (:start :end))
(Registration (:id :method) (:registerOptions))
(ResponseError (:code :message) (:data))
(ShowMessageParams (:type :message))
(ShowMessageRequestParams (:type :message) (:actions))
(SignatureHelp (:signatures) (:activeSignature :activeParameter))
(SignatureInformation (:label) (:documentation :parameters :activeParameter))
(SymbolInformation (:name :kind :location)
(:deprecated :containerName))
(DocumentSymbol (:name :range :selectionRange :kind)
;; `:containerName' isn't really allowed , but
;; it simplifies the impl of `eglot-imenu'.
(:detail :deprecated :children :containerName))
(TextDocumentEdit (:textDocument :edits) ())
(TextEdit (:range :newText))
(VersionedTextDocumentIdentifier (:uri :version) ())
(WorkspaceEdit () (:changes :documentChanges))
)
"Alist (INTERFACE-NAME . INTERFACE) of known external LSP interfaces.
INTERFACE-NAME is a symbol designated by the spec as
\"interface\". INTERFACE is a list (REQUIRED OPTIONAL) where
REQUIRED and OPTIONAL are lists of KEYWORD designating field
names that must be, or may be, respectively, present in a message
adhering to that interface. KEY can be a keyword or a cons (SYM
TYPE), where type is used by `cl-typep' to check types at
runtime.
Here's what an element of this alist might look like:
(Command ((:title . string) (:command . string)) (:arguments))"))
(eval-and-compile
(defvar eglot-strict-mode (if load-file-name '()
'(disallow-non-standard-keys
;; Uncomment these two for fun at
;; compile-time or with flymake-mode.
;;
;; enforce-required-keys
;; enforce-optional-keys
))
"How strictly to check LSP interfaces at compile- and run-time.
Value is a list of symbols (if the list is empty, no checks are
performed).
If the symbol `disallow-non-standard-keys' is present, an error
is raised if any extraneous fields are sent by the server. At
compile-time, a warning is raised if a destructuring spec
includes such a field.
If the symbol `enforce-required-keys' is present, an error is
raised if any required fields are missing from the message sent
from the server. At compile-time, a warning is raised if a
destructuring spec doesn't use such a field.
If the symbol `enforce-optional-keys' is present, nothing special
happens at run-time. At compile-time, a warning is raised if a
destructuring spec doesn't use all optional fields.
If the symbol `disallow-unknown-methods' is present, Eglot warns
on unknown notifications and errors on unknown requests."))
(cl-defun eglot--check-object (interface-name
object
&optional
(enforce-required t)
(disallow-non-standard t)
(check-types t))
"Check that OBJECT conforms to INTERFACE. Error otherwise."
(cl-destructuring-bind
(&key types required-keys optional-keys &allow-other-keys)
(eglot--interface interface-name)
(when-let ((missing (and enforce-required
(cl-set-difference required-keys
(eglot--plist-keys object)))))
(eglot--error "A `%s' must have %s" interface-name missing))
(when-let ((excess (and disallow-non-standard
(cl-set-difference
(eglot--plist-keys object)
(append required-keys optional-keys)))))
(eglot--error "A `%s' mustn't have %s" interface-name excess))
(when check-types
(cl-loop
for (k v) on object by #'cddr
for type = (or (cdr (assoc k types)) t) ;; FIXME: enforce nil type?
unless (cl-typep v type)
do (eglot--error "A `%s' must have a %s as %s, but has %s"
interface-name )))
t))
(eval-and-compile
(defun eglot--keywordize-vars (vars)
(mapcar (lambda (var) (intern (format ":%s" var))) vars))
(defun eglot--ensure-type (k) (if (consp k) k (cons k t)))
(defun eglot--interface (interface-name)
(let* ((interface (assoc interface-name eglot--lsp-interface-alist))
(required (mapcar #'eglot--ensure-type (car (cdr interface))))
(optional (mapcar #'eglot--ensure-type (cadr (cdr interface)))))
(list :types (append required optional)
:required-keys (mapcar #'car required)
:optional-keys (mapcar #'car optional))))
(defun eglot--check-dspec (interface-name dspec)
"Check destructuring spec DSPEC against INTERFACE-NAME."
(cl-destructuring-bind (&key required-keys optional-keys &allow-other-keys)
(eglot--interface interface-name)
(cond ((or required-keys optional-keys)
(let ((too-many
(and
(memq 'disallow-non-standard-keys eglot-strict-mode)
(cl-set-difference
(eglot--keywordize-vars dspec)
(append required-keys optional-keys))))
(ignored-required
(and
(memq 'enforce-required-keys eglot-strict-mode)
(cl-set-difference
required-keys (eglot--keywordize-vars dspec))))
(missing-out
(and
(memq 'enforce-optional-keys eglot-strict-mode)
(cl-set-difference
optional-keys (eglot--keywordize-vars dspec)))))
(when too-many (byte-compile-warn
"Destructuring for %s has extraneous %s"
interface-name too-many))
(when ignored-required (byte-compile-warn
"Destructuring for %s ignores required %s"
interface-name ignored-required))
(when missing-out (byte-compile-warn
"Destructuring for %s is missing out on %s"
interface-name missing-out))))
(t
(byte-compile-warn "Unknown LSP interface %s" interface-name))))))
(cl-defmacro eglot--dbind (vars object &body body)
"Destructure OBJECT, binding VARS in BODY.
VARS is ([(INTERFACE)] SYMS...)
Honour `eglot-strict-mode'."
(declare (indent 2) (debug (sexp sexp &rest form)))
(let ((interface-name (if (consp (car vars))
(car (pop vars))))
(object-once (make-symbol "object-once"))
(fn-once (make-symbol "fn-once")))
(cond (interface-name
(eglot--check-dspec interface-name vars)
`(let ((,object-once ,object))
(cl-destructuring-bind (&key ,@vars &allow-other-keys) ,object-once
(eglot--check-object ',interface-name ,object-once
(memq 'enforce-required-keys eglot-strict-mode)
(memq 'disallow-non-standard-keys eglot-strict-mode)
(memq 'check-types eglot-strict-mode))
,@body)))
(t
`(let ((,object-once ,object)
(,fn-once (lambda (,@vars) ,@body)))
(if (memq 'disallow-non-standard-keys eglot-strict-mode)
(cl-destructuring-bind (&key ,@vars) ,object-once
(funcall ,fn-once ,@vars))
(cl-destructuring-bind (&key ,@vars &allow-other-keys) ,object-once
(funcall ,fn-once ,@vars))))))))
(cl-defmacro eglot--lambda (cl-lambda-list &body body)
"Function of args CL-LAMBDA-LIST for processing INTERFACE objects.
Honour `eglot-strict-mode'."
(declare (indent 1) (debug (sexp &rest form)))
(let ((e (cl-gensym "jsonrpc-lambda-elem")))
`(lambda (,e) (eglot--dbind ,cl-lambda-list ,e ,@body))))
(cl-defmacro eglot--dcase (obj &rest clauses)
"Like `pcase', but for the LSP object OBJ.
CLAUSES is a list (DESTRUCTURE FORMS...) where DESTRUCTURE is
treated as in `eglot-dbind'."
(declare (indent 1) (debug (sexp &rest (sexp &rest form))))
(let ((obj-once (make-symbol "obj-once")))
`(let ((,obj-once ,obj))
(cond
,@(cl-loop
for (vars . body) in clauses
for vars-as-keywords = (eglot--keywordize-vars vars)
for interface-name = (if (consp (car vars))
(car (pop vars)))
for condition =
(cond (interface-name
(eglot--check-dspec interface-name vars)
;; In this mode, in runtime, we assume
;; `eglot-strict-mode' is partially on, otherwise we
;; can't disambiguate between certain types.
`(ignore-errors
(eglot--check-object
',interface-name ,obj-once
t
(memq 'disallow-non-standard-keys eglot-strict-mode)
t)))
(t
;; In this interface-less mode we don't check
;; `eglot-strict-mode' at all: just check that the object
;; has all the keys the user wants to destructure.
`(null (cl-set-difference
',vars-as-keywords
(eglot--plist-keys ,obj-once)))))
collect `(,condition
(cl-destructuring-bind (&key ,@vars &allow-other-keys)
,obj-once
,@body)))
(t
(eglot--error "%S didn't match any of %S"
,obj-once
',(mapcar #'car clauses)))))))
;;; API (WORK-IN-PROGRESS!)
;;;
(cl-defmacro eglot--when-live-buffer (buf &rest body)
"Check BUF live, then do BODY in it." (declare (indent 1) (debug t))
(let ((b (cl-gensym)))
`(let ((,b ,buf)) (if (buffer-live-p ,b) (with-current-buffer ,b ,@body)))))
(cl-defmacro eglot--when-buffer-window (buf &body body)
"Check BUF showing somewhere, then do BODY in it." (declare (indent 1) (debug t))
(let ((b (cl-gensym)))
`(let ((,b ,buf))
;;notice the exception when testing with `ert'
(when (or (get-buffer-window ,b) (ert-running-test))
(with-current-buffer ,b ,@body)))))
(cl-defmacro eglot--widening (&rest body)
"Save excursion and restriction. Widen. Then run BODY." (declare (debug t))
`(save-excursion (save-restriction (widen) ,@body)))
(cl-defgeneric eglot-handle-request (server method &rest params)
"Handle SERVER's METHOD request with PARAMS.")
(cl-defgeneric eglot-handle-notification (server method &rest params)
"Handle SERVER's METHOD notification with PARAMS.")
(cl-defgeneric eglot-execute-command (server command arguments)
"Ask SERVER to execute COMMAND with ARGUMENTS.")
(cl-defgeneric eglot-initialization-options (server)
"JSON object to send under `initializationOptions'."
(:method (_s) eglot--{})) ; blank default
(cl-defgeneric eglot-register-capability (server method id &rest params)
"Ask SERVER to register capability METHOD marked with ID."
(:method
(_s method _id &rest _params)
(eglot--warn "Server tried to register unsupported capability `%s'"
method)))
(cl-defgeneric eglot-unregister-capability (server method id &rest params)
"Ask SERVER to register capability METHOD marked with ID."
(:method
(_s method _id &rest _params)
(eglot--warn "Server tried to unregister unsupported capability `%s'"
method)))
(cl-defgeneric eglot-client-capabilities (server)
"What the EGLOT LSP client supports for SERVER."
(:method (_s)
(list
:workspace (list
:applyEdit t
:executeCommand `(:dynamicRegistration :json-false)
:workspaceEdit `(:documentChanges :json-false)
:didChangeWatchedFiles `(:dynamicRegistration t)
:symbol `(:dynamicRegistration :json-false)
:configuration t)
:textDocument
(list
:synchronization (list
:dynamicRegistration :json-false
:willSave t :willSaveWaitUntil t :didSave t)
:completion (list :dynamicRegistration :json-false
:completionItem
`(:snippetSupport
,(if (eglot--snippet-expansion-fn)
t
:json-false)
:deprecatedSupport t
:tagSupport (:valueSet [1]))
:contextSupport t)
:hover (list :dynamicRegistration :json-false
:contentFormat
(if (fboundp 'gfm-view-mode)
["markdown" "plaintext"]
["plaintext"]))
:signatureHelp (list :dynamicRegistration :json-false
:signatureInformation
`(:parameterInformation
(:labelOffsetSupport t)
:activeParameterSupport t))
:references `(:dynamicRegistration :json-false)
:definition (list :dynamicRegistration :json-false
:linkSupport t)
:declaration (list :dynamicRegistration :json-false
:linkSupport t)
:implementation (list :dynamicRegistration :json-false
:linkSupport t)
:typeDefinition (list :dynamicRegistration :json-false
:linkSupport t)
:documentSymbol (list
:dynamicRegistration :json-false
:hierarchicalDocumentSymbolSupport t
:symbolKind `(:valueSet
[,@(mapcar
#'car eglot--symbol-kind-names)]))
:documentHighlight `(:dynamicRegistration :json-false)
:codeAction (list
:dynamicRegistration :json-false
:codeActionLiteralSupport
'(:codeActionKind
(:valueSet
["quickfix"
"refactor" "refactor.extract"
"refactor.inline" "refactor.rewrite"
"source" "source.organizeImports"]))
:isPreferredSupport t)
:formatting `(:dynamicRegistration :json-false)
:rangeFormatting `(:dynamicRegistration :json-false)
:rename `(:dynamicRegistration :json-false)
:publishDiagnostics (list :relatedInformation :json-false
;; TODO: We can support :codeDescription after
;; adding an appropriate UI to
;; Flymake.
:codeDescriptionSupport :json-false
:tagSupport
`(:valueSet
[,@(mapcar
#'car eglot--tag-faces)])))
:experimental eglot--{})))
(defclass eglot-lsp-server (jsonrpc-process-connection)
((project-nickname
:documentation "Short nickname for the associated project."
:accessor eglot--project-nickname
:reader eglot-project-nickname)
(major-mode
:documentation "Major mode symbol."
:accessor eglot--major-mode)
(language-id
:documentation "Language ID string for the mode."
:accessor eglot--language-id)
(capabilities
:documentation "JSON object containing server capabilities."
:accessor eglot--capabilities)
(server-info
:documentation "JSON object containing server info."
:accessor eglot--server-info)
(shutdown-requested
:documentation "Flag set when server is shutting down."
:accessor eglot--shutdown-requested)
(project
:documentation "Project associated with server."
:accessor eglot--project)
(spinner
:documentation "List (ID DOING-WHAT DONE-P) representing server progress."
:initform `(nil nil t) :accessor eglot--spinner)
(inhibit-autoreconnect
:initform t
:documentation "Generalized boolean inhibiting auto-reconnection if true."
:accessor eglot--inhibit-autoreconnect)
(file-watches
:documentation "Map ID to list of WATCHES for `didChangeWatchedFiles'."
:initform (make-hash-table :test #'equal) :accessor eglot--file-watches)
(managed-buffers
:documentation "List of buffers managed by server."
:accessor eglot--managed-buffers)
(saved-initargs
:documentation "Saved initargs for reconnection purposes."
:accessor eglot--saved-initargs)
(inferior-process
:documentation "Server subprocess started automatically."
:accessor eglot--inferior-process))
:documentation
"Represents a server. Wraps a process for LSP communication.")
;;; Process management
(defvar eglot--servers-by-project (make-hash-table :test #'equal)
"Keys are projects. Values are lists of processes.")
(defun eglot-shutdown (server &optional _interactive timeout preserve-buffers)
"Politely ask SERVER to quit.
Interactively, read SERVER from the minibuffer unless there is
only one and it's managing the current buffer.
Forcefully quit it if it doesn't respond within TIMEOUT seconds.
TIMEOUT defaults to 1.5 seconds. Don't leave this function with
the server still running.
If PRESERVE-BUFFERS is non-nil (interactively, when called with a
prefix argument), do not kill events and output buffers of
SERVER."
(interactive (list (eglot--read-server "Shutdown which server"
(eglot-current-server))
t nil current-prefix-arg))
(eglot--message "Asking %s politely to terminate" (jsonrpc-name server))
(unwind-protect
(progn
(setf (eglot--shutdown-requested server) t)
(jsonrpc-request server :shutdown nil :timeout (or timeout 1.5))
(jsonrpc-notify server :exit nil))
;; Now ask jsonrpc.el to shut down the server.
(jsonrpc-shutdown server (not preserve-buffers))
(unless preserve-buffers (kill-buffer (jsonrpc-events-buffer server)))))
(defun eglot-shutdown-all (&optional preserve-buffers)
"Politely ask all language servers to quit, in order.
PRESERVE-BUFFERS as in `eglot-shutdown', which see."
(interactive (list current-prefix-arg))
(cl-loop for ss being the hash-values of eglot--servers-by-project
do (cl-loop for s in ss do (eglot-shutdown s nil preserve-buffers))))
(defun eglot--on-shutdown (server)
"Called by jsonrpc.el when SERVER is already dead."
;; Turn off `eglot--managed-mode' where appropriate.
(dolist (buffer (eglot--managed-buffers server))
(let (;; Avoid duplicate shutdowns (github#389)
(eglot-autoshutdown nil))
(eglot--when-live-buffer buffer (eglot--managed-mode-off))))
;; Kill any expensive watches
(maphash (lambda (_id watches)
(mapcar #'file-notify-rm-watch watches))
(eglot--file-watches server))
;; Kill any autostarted inferior processes
(when-let (proc (eglot--inferior-process server))
(delete-process proc))
;; Sever the project/server relationship for `server'
(setf (gethash (eglot--project server) eglot--servers-by-project)
(delq server
(gethash (eglot--project server) eglot--servers-by-project)))
(cond ((eglot--shutdown-requested server)
t)
((not (eglot--inhibit-autoreconnect server))
(eglot--warn "Reconnecting after unexpected server exit.")
(eglot-reconnect server))
((timerp (eglot--inhibit-autoreconnect server))
(eglot--warn "Not auto-reconnecting, last one didn't last long."))))
(defun eglot--all-major-modes ()
"Return all known major modes."
(let ((retval))
(mapatoms (lambda (sym)
(when (plist-member (symbol-plist sym) 'derived-mode-parent)
(push sym retval))))
retval))
(defvar eglot--command-history nil
"History of CONTACT arguments to `eglot'.")
(defun eglot--lookup-mode (mode)
"Lookup `eglot-server-programs' for MODE.
Return (LANGUAGE-ID . CONTACT-PROXY). If not specified,
LANGUAGE-ID is determined from MODE."
(cl-loop
for (modes . contact) in eglot-server-programs
thereis (cl-some
(lambda (spec)
(cl-destructuring-bind (probe &key language-id &allow-other-keys)
(if (consp spec) spec (list spec))
(and (provided-mode-derived-p mode probe)
(cons
(or language-id
(or (get mode 'eglot-language-id)
(get spec 'eglot-language-id)
(string-remove-suffix "-mode" (symbol-name mode))))
contact))))
(if (or (symbolp modes) (keywordp (cadr modes)))
(list modes) modes))))
(defun eglot--guess-contact (&optional interactive)
"Helper for `eglot'.
Return (MANAGED-MODE PROJECT CLASS CONTACT LANG-ID). If INTERACTIVE is
non-nil, maybe prompt user, else error as soon as something can't
be guessed."
(let* ((guessed-mode (if buffer-file-name major-mode))
(managed-mode
(cond
((and interactive
(or (>= (prefix-numeric-value current-prefix-arg) 16)
(not guessed-mode)))
(intern
(completing-read
"[eglot] Start a server to manage buffers of what major mode? "
(mapcar #'symbol-name (eglot--all-major-modes)) nil t
(symbol-name guessed-mode) nil (symbol-name guessed-mode) nil)))
((not guessed-mode)
(eglot--error "Can't guess mode to manage for `%s'" (current-buffer)))
(t guessed-mode)))
(lang-id-and-guess (eglot--lookup-mode guessed-mode))
(language-id (car lang-id-and-guess))
(guess (cdr lang-id-and-guess))
(guess (if (functionp guess)
(funcall guess interactive)
guess))
(class (or (and (consp guess) (symbolp (car guess))
(prog1 (unless current-prefix-arg (car guess))
(setq guess (cdr guess))))
'eglot-lsp-server))
(program (and (listp guess)
(stringp (car guess))
;; A second element might be the port of a (host, port)
;; pair, but in that case it is not a string.
(or (null (cdr guess)) (stringp (cadr guess)))
(car guess)))
(base-prompt
(and interactive
"Enter program to execute (or <host>:<port>): "))
(program-guess
(and program
(combine-and-quote-strings (cl-subst ":autoport:"
:autoport guess))))
(prompt
(and base-prompt
(cond (current-prefix-arg base-prompt)
((null guess)
(format "[eglot] Sorry, couldn't guess for `%s'!\n%s"
managed-mode base-prompt))
((and program
(not (file-name-absolute-p program))
(not (eglot--executable-find program t)))
(concat (format "[eglot] I guess you want to run `%s'"
program-guess)
(format ", but I can't find `%s' in PATH!" program)
"\n" base-prompt)))))
(contact
(or (and prompt
(let ((s (read-shell-command
prompt
program-guess
'eglot-command-history)))
(if (string-match "^\\([^\s\t]+\\):\\([[:digit:]]+\\)$"
(string-trim s))
(list (match-string 1 s)
(string-to-number (match-string 2 s)))
(cl-subst
:autoport ":autoport:" (split-string-and-unquote s)
:test #'equal))))
guess
(eglot--error "Couldn't guess for `%s'!" managed-mode))))
(list managed-mode (eglot--current-project) class contact language-id)))
(defvar eglot-lsp-context)
(put 'eglot-lsp-context 'variable-documentation
"Dynamically non-nil when searching for projects in LSP context.")
(defvar eglot--servers-by-xrefed-file
(make-hash-table :test 'equal :weakness 'value))
(defun eglot--current-project ()
"Return a project object for Eglot's LSP purposes.
This relies on `project-current' and thus on
`project-find-functions'. Functions in the latter
variable (which see) can query the value `eglot-lsp-context' to
decide whether a given directory is a project containing a
suitable root directory for a given LSP server's purposes."
(let ((eglot-lsp-context t))
(or (project-current) `(transient . ,default-directory))))
;;;###autoload
(defun eglot (managed-major-mode project class contact language-id
&optional interactive)
"Manage a project with a Language Server Protocol (LSP) server.
The LSP server of CLASS is started (or contacted) via CONTACT.
If this operation is successful, current *and future* file
buffers of MANAGED-MAJOR-MODE inside PROJECT become \"managed\"
by the LSP server, meaning information about their contents is
exchanged periodically to provide enhanced code-analysis via
`xref-find-definitions', `flymake-mode', `eldoc-mode',
`completion-at-point', among others.
Interactively, the command attempts to guess MANAGED-MAJOR-MODE
from current buffer, CLASS and CONTACT from
`eglot-server-programs' and PROJECT from
`project-find-functions'. The search for active projects in this
context binds `eglot-lsp-context' (which see).
If it can't guess, the user is prompted. With a single
\\[universal-argument] prefix arg, it always prompt for COMMAND.
With two \\[universal-argument] prefix args, also prompts for
MANAGED-MAJOR-MODE.
PROJECT is a project object as returned by `project-current'.
CLASS is a subclass of `eglot-lsp-server'.
CONTACT specifies how to contact the server. It is a
keyword-value plist used to initialize CLASS or a plain list as
described in `eglot-server-programs', which see.
LANGUAGE-ID is the language ID string to send to the server for
MANAGED-MAJOR-MODE, which matters to a minority of servers.
INTERACTIVE is t if called interactively."
(interactive (append (eglot--guess-contact t) '(t)))
(let* ((current-server (eglot-current-server))
(live-p (and current-server (jsonrpc-running-p current-server))))
(if (and live-p
interactive
(y-or-n-p "[eglot] Live process found, reconnect instead? "))
(eglot-reconnect current-server interactive)
(when live-p (ignore-errors (eglot-shutdown current-server)))
(eglot--connect managed-major-mode project class contact language-id))))
(defun eglot-reconnect (server &optional interactive)
"Reconnect to SERVER.
INTERACTIVE is t if called interactively."
(interactive (list (eglot--current-server-or-lose) t))
(when (jsonrpc-running-p server)
(ignore-errors (eglot-shutdown server interactive nil 'preserve-buffers)))
(eglot--connect (eglot--major-mode server)